In project management and engineering practice, particularly in German-speaking countries, the requirements specification and the functional specification play a central role. They serve to precisely define and document the requirements and specifications of a project. Although the two terms are often confused, they have different functions and content.
Requirements specification
The Requirements specification It is prepared by the client and includes a comprehensive description of the project requirements from the client's perspective. It defines, WAS to be achieved without compromising the AS to address this. For an e-commerce shop, the requirements specification could, for example, include the following points:
- objective: Description of the overarching business objectives to be achieved with the shop (e.g., increasing sales, reaching new customer groups).
- Functional requirements: List of required functions such as product catalog, shopping cart, search function, payment systems, customer account management, etc.
- Non-functional requirements: guidelines for user-friendliness, Performance , security, mobile compatibility and SEO optimization.
- Design and brand guidelines: Information on visual appearance, corporate design guidelines, use of brand logos, etc.
- Legal and regulatory requirements: Information on data protection regulations, legal notice requirements, terms and conditions, etc.
Specifications
The Specifications In contrast, the contractor (often in consultation with the client) creates and answers the AS The requirements specification outlines the specifications outlined in the requirements document. It serves as the technical specification and contains detailed information on how the requirements are to be implemented. For our e-commerce shop, the requirements specification could contain the following information:
- Technical specifications: Selection of the software platform (e.g. Magento, Shopify), databases, programming languages, integration of existing systems.
- Detailed planning of functionalities: Detailed description of the implementation of individual functions, including interfaces, user flows, and data modeling.
- Security concept: Description of the safety measures for Protection against cyberattacks, data leaks, etc.
- Test Procedure: Definition of test processes for quality assurance, including unit tests, integration tests, and usability tests.
- Project planning: Timeline, resource planning, milestones, budgeting.
Example of an e-commerce project

How do I create a requirements specification for a Online-Shop ? - Storetown-Media Internal – What is a requirements specification? Example: Online shop creation
Excerpt from the requirements specification:
- objective: Increase online sales by 30% within the next two years.
- Functional requirements: Setting up a user-friendly, multilingual product catalog function with an integrated shopping cart system and various payment options (PayPal, Credit card, instant bank transfer).
- Design and brand guidelines: The shop should reflect the current corporate design and be presented uniformly and attractively on all devices (desktop, tablet, smartphone).
Excerpt from the specifications:
- Technical specifications: The shop is being developed using Shopify with individual customizations. Product information is imported from the existing ERP system via an API.
- Detailed planning of functionalities: The search function will be integrated with Elasticsearch. Payment processing will be handled by an external payment service provider that supports the required payment methods.
- Test Procedure: An iterative testing process with regular releases and feedback loops will be implemented. A comprehensive penetration test will be conducted before go-live.
The creation of these documents requires close cooperation between the client and the contractor to ensure that all requirements are correctly understood and planned.






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